(Bloomberg) -- Some of the world’s biggest energy trading companies are returning to metals, years after getting burnt in the notoriously difficult markets.Most Read from BloombergTaylor Swift Is Proof That How We Critique Music Is BrokenBiden’s New Chopper Is Demoted After Scorching White House LawnTesla Speeds Cheaper EV Plans, Calming Fears Over StrategyBillionaire Pinaults Fight to Pull Gucci Off the Discount RackRay Dalio’s Famous Trade Is Sputtering, Investors BailingVitol Group, Gunvor Gr